2251EIS INTRINSICALLY SAFE DETECTOR AND IST200 INTERFACE

The 2251EIS analogue addressable photoelectric sensor is a plug in Intrinsically Safe smoke sensor combining an optical sensing chamber with analogue addressable communications. As an Intrinsically Safe sensor, the 2251EIS has been designed specifically to provide fire protection for most hazardous environments, and has therefore been engineered so that it cannot become a source of ignition in areas where potentially explosive atmospheres are likely to arise.

The IST200 translator module serves as an interface between the control panel and up to a maximum of 15 x 2251EIS smoke sensors. The IST200 must be used in conjunction with a Y72221 custom galvanic isolator barrier.

Tested and approved to EN54-7 and by BASEEFA (2001) to

EEx ia IIB T5 for use in Zone 0 hazardous areas.

Specifications

Note that there are limitations of capacitance, inductance and inductance/resistance ratio connected within the hazardous area. Reference must therefore be made to product data before installation of these devices.

Voltage:

17 to 24VDC

Max. standby current:

330µA

 

(One communication every 5s

 

with LED blink enabled)

Max. alarm current:

4.2mA at 24VDC

Weight:

102g

IST200

 

Input Voltage:

15 to 32VDC

Output Voltage:

20 to 24VDC

Supply Current:

14mA at 24VDC

Dimensions:

70mm x 70mm x 32mm (h x w x d)

Weight:

142g

Note: This document is based on the recommendations of BS5839 Part 1: 2002. It is intended only as a guide to the application of fire detection systems.

Reference must be made to relevant national and local standards.

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System Sensor BS5839 manual 2251EIS Intrinsically Safe Detector and IST200 Interface, With LED blink enabled

BS5839 specifications

System Sensor BS5839 is a standard that pertains to fire detection and alarm systems, providing guidelines for the design, installation, and maintenance of these essential safety tools. It is crucial for safeguarding lives and property, ensuring that fire detection systems are effective and reliable. The BS5839 standard, established in the UK, covers a wide range of fire alarm system types, including conventional, addressable, and wireless systems.

One of the main features of BS5839 is its comprehensive classification of fire detection systems. The standard divides systems into categories based on the level of risk and the environment in which the system will operate. This classification helps ensure that the system installed meets the specific needs of the building and its occupants. For example, Category L systems are meant for life safety, while Category P systems are designed to protect property.

The technologies underpinning BS5839 include various types of detectors, alarm devices, and control panels. Smoke detectors, heat detectors, and multi-sensor detectors are prominent among the devices specified in the standard. Smoke detectors use photoelectric or ionization principles to detect smoke and signal an alarm, while heat detectors respond to temperature changes. Multi-sensor detectors combine both smoke and heat detection technologies to provide a more reliable response to fire conditions.

Another key characteristic of BS5839 is the emphasis on regular testing and maintenance. The standard outlines procedures to ensure that systems remain operational and effective over time. This includes routine system checks, functional testing, and more in-depth inspections at regular intervals. Ensuring that systems are maintained according to BS5839 is vital for compliance with insurance requirements and for safeguarding against potential legal liabilities.

Furthermore, BS5839 highlights the importance of staff training and awareness. It emphasizes that personnel responsible for fire safety must be adequately trained in the operation and response to fire alarm systems. This ensures that in the event of a fire, occupants are prompted to take appropriate action and evacuate safely.

In summary, System Sensor BS5839 provides a crucial framework for fire detection and alarm systems. Its classification of systems, incorporation of advanced technologies, and emphasis on maintenance all contribute to enhanced safety and compliance, protecting lives and property effectively.